chore(package): update mocha to version 7.2.0

Closes #18

Author: greenkeeper[bot]

package.json

@@ -24,7 +24,7 @@
 		"eslint-config-google": "^0.10.0",
 		"jsdoc": "^3.5.5",
 		"jsdoc-to-markdown": "^4.0.1",
-		"mocha": "^5.2.0",
+		"mocha": "^7.2.0",
 		"mocha-junit-reporter": "^1.17.0",
 		"nyc": "^12.0.2",
 		"rewire": "^4.0.1",